Drum fob



G JAEGER DRUM FOR CONCRETE MIXERS.

APPLICATION FILED FEB. B. l9l`5. 19322575, Patented Nov. 1919.

62K) ifm/1 e we A GERHARD JAEGER, AIi"(`OLUlllIB`US, OHIO.

DRUM FOR CONCRETE-MIXERS.

Specification of Letters Iatemz.Y Patented Nov. 25, 1919.

Application led February 8, 1915. Serial No. 6,702.

To all whom t may concern.' K

Be it known that I, GEBHARD JAEGER, a citizen of the United States, residing at Columbus, inthe county of Franklin and Stateof Ohio, have invented a certain new and useful Improvement 1n Drums for Concretev Mixers, of which the following is a speciliconstruction in which the mixing operationl is performed thoroughly and more rapidly l than heretofore.

The invention is embodied in the construction and combination of features shown in the accompanying drawings and set forth in the following description andlcla-ims.

In said drawing- Figure 1 is a view in elevation of the mixing device in which the invention is embodied, a portionof the drum being broken out to illustrate interior details.

Fig. 2 is a view in elevation looking at one side of the drum alone. l

Fig. 3 is a similar' view looking from a point ninety degrees from the point fromV which Fig. 2 is viewed.

Fig. 4. is a top plan view withv the drum erect and in horizontal section on the line m-a2 Fig. 3.

VThe body of the drum is constructed with .a frusto-conical upper wall 5 on a base portion -havingopposite curved walls 6, 6', and opposite flat walls 7,' 7, joined to said curved walls 6, 6, and a bottom portion 8 thereby forming four corners in thel sides of the lower portion of the drum. rlhe flat walls 7 7, form, in e'ect, a peculiar interruption of the continuity of a curved surface and vif A the drum 'be rotated while its axis is inclined to the vertical a'sseen in Fig. 1 the movement of the material is retarded by the flatV surfaces.

Coperating with the peculiar structure of' these walls near the bottom of .the drum are blades 9,' 9, which are offset a little from and are arranged inclined to the curved surfaces 62 6, and walls and extend in angular direction with reference to the axis4 ofA ried or su .yoke has trunnions at its ends that are journaled in standards 1.2 so that by swinging the yoke the drum can be oscilla-ted as by Y handles at 13 on one of the trunnions to different positions for supplying material to the drum, mixing and discharging the same. The drum is also provided with a circumambient rack 14 engaged b y a pinion 14 onv a shaft 15 for imparting rotary motion to the drum. The construction with reference to the means for tilting the drum to diiferent positions and imparting rotary motion to the drumin such tilted position are now well known in the art and need no further detailing here.

In practice the drum is adjusted to have its axis stand at an inclination'of about 35 degrees tothe horizontal and is rotated in the direction indicated by the arrows in Figs. 1 and 4. The materialsl to be mixed are supplied and made wet through the mouth of the drum at the smaller end of the frusto-conical portion. construction and operation is to cause the materialsto move inward and outward with reference to the mouth Vof the drum. @n the flat surfaces the material slides toward the bottom of the drum while on the curved surfaces the material moves Outward toward the mouth of the drum and the combination,

also tends to impart a swirling motion to the fluent material. Ilihe material in its outrIhe result ,of the ward movement tends to accumulate .against the blades and upon suilicient vrotation it falls off the blades onto the fiat surfaces. The inward and outward movement generally of the material with reference to the mouth'of the drum is therefore quito pronounced. The materialin the'drum therefore vhas in one sense two motionsv one the ordinary which is dueto the rotary motionv of the drum and the other due to .the form of the walls, this latter movement being valemented bythe presence of the blades. he mixing eect is further aided by the projection of the tubular bearing intfo the .'The'fmaterial, when'it slides oit' tion without departingifrom Lthe gist of the invention as claimed;

What I claim is: e i v 1.v lIn a concrete mixer, the combination of a mixing drum having a bottom and a'feeding and 'discharging opening opposite the bottom, means for mounting-the drum to rotate on an axis substantially at right angles to 4the bottom, said bottom having joined therewith curved and flat Walls alternating with each other. Y

2. In a concrete mixer, the combination of a mixing drum having a closed4 bottom and a feeding4 and discharging opening opposite the bottom, means for mounting the drum to rotate on an axis substantially at A right angles to the bottom, said bottom hav- .ing joined therewith curved and flat walls a feeding and discharging opening opposite the bottom, means for mounting the drum nating with each other, `a blade on the side of the drum, and an axial projection from said bottom coperating With said curved andflat Walls and said blade.

4. In a concrete mixer, the combination of a mixing drum having a closed bottom and feeding and discharging opening opposite the bottom, means for mounting the drum to rotate on'an axis substantially at right angles to the bottom, said bottom formed With a curved Wall interrupted by a retarding Wall forming a continuation of said curved Wall, substantially as described.

GEBHARD JAEGER. Witnesses:

WILLIAM H. PETERS, BENJAMIN FINGKEL. 

